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Fuel pump

Vanrouge

By Vanrouge
in BMW 2002 and other '02

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Vanrouge Newbie

Vanrouge

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Posted

I am rebuilding a 2002 Tii rally car which has a Alpina A4S engine with the four throttle mechanical fuel injection that was rebuilt by Lester Owen some years ago - I'm guessing at circa 175 to 185BHP. I want to replace the twin electric fuel pumps that circulate the fuel from the fuel tank at the back of the car up to the mechanical pump on the engine.

Could anyone advise on approximate flow rate and pressure needed as one of the old ones is missing and the other has no markings on it so I can't tell what was there before! They are connected in parallel so that each can independently be switched to pump fuel.

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Mike Self Grand Master

Mike Self

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Posted

According to the factory shop manual, the OEM Bosch pump for a tii provides fuel 28.5 psi and a rate of 29 gallons/hour (61 oz/min).  As I'm sure you know, that's an external electric pump mounted back by the rear axle, and unlike mechanical fuel pumps (which like to suck fuel), electric pumps prefer to push fuel.

 

Just a logical guess, but since the Alpina system is based on the tii mechanical FI (Kugelfisher) whatever the flow rate is on the factory tii fuel pump should be at least adequate.  

 

cheers

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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